Normalizing heat treatment tool applied to large hub

Abstract

The utility model relates to the technical field of heat treatment tools, in particular to a normalizing heat treatment tool applied to a large hub, which comprises at least three groups of support bodies which are sequentially connected, each group of support bodies are fixedly connected through a connecting body, each group of support bodies comprises two support bodies which are symmetrically arranged, the two supporting bodies in the same group are fixedly connected through the connecting body, each supporting body comprises an inner core and an outer shell which are arranged in an inner and outer nesting mode, and the outer shell of each supporting body is provided with a stable foot stand. The large wheel hub normalizing heat treatment device is low in manufacturing cost, capable of safely, stably and fixedly placing a large wheel hub for normalizing heat treatment, not prone to deformation, capable of being repeatedly used and long in service life.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment tooling technology, and in particular to a normalizing heat treatment tooling for large wheel hubs. Background Technology

[0002] Large wheel hubs require a support frame for stable placement during the normalizing heat treatment process. Currently used separate supports are cumbersome to install and pose safety risks to operators. Furthermore, tilting the wheel hub can lead to uneven heating, ultimately rendering the product unusable. Therefore, a one-piece wheel hub normalizing heat treatment fixture is needed, capable of stably placing the wheel hub for normalizing heat treatment and subsequent air cooling.

[0003] For example, Chinese patent CN104139280B discloses a manufacturing process for a wheel hub, which includes a normalizing step. When performing normalizing heat treatment on large wheel hubs, a fixture capable of stably supporting the hub is needed to facilitate placement and improve safety. Utility Model Content

[0004] To address the problems in the existing technology, this utility model proposes a normalizing heat treatment fixture for large wheel hubs, which can safely and stably fix large wheel hubs, and has a small deformation and long service life when heat treated together with the wheel hub.

[0005] To achieve the above-mentioned technical effects, this utility model proposes:

[0006] A normalizing heat treatment fixture for large wheel hubs includes at least three sets of support bodies connected in sequence. Each set of support bodies is fixedly connected to the others by a connector. Each set of support bodies includes two symmetrically arranged support bodies. The two support bodies in the same set are fixedly connected by the connector. Each support body includes an inner core and an outer shell that are nested inside and outside. Each outer shell of the support body is provided with a stable foot.

[0007] Taking a tooling fixture formed by connecting three sets of supports as an example, each set of supports consists of two supports arranged in two columns and three rows. Adjacent supports are connected by connectors. The length of the supports is set according to the large diameter sections at both ends and the small diameter section in the middle of the wheel hub, thus forming a tooling fixture that stably supports the wheel hub. To ensure that the tooling retains its original shape and does not deform significantly during heat treatment, the supports are designed with a nested structure of inner core and outer shell. The inner core is made of cast iron, which is not easily deformed during normalizing heat treatment, while the outer shell is made of weldable steel plate to ensure the overall stability of the tooling fixture.

[0008] The support body includes a first support body, a second support body, and a third support body, and the three types of support bodies are connected in sequence.

[0009] The outer shell has an opening at the top, and the inner core is embedded inside the outer shell and fixedly connected thereto, with the top of the inner core flush with the top of the outer shell.

[0010] The top of the support body is an arc-shaped mating surface, and the arc-shaped mating surfaces of two supports in the same group are arranged opposite each other. The top of the inner core and the outer shell are flush and form an arc-shaped mating surface. The arc-shaped mating surfaces of two supports in the same group are arranged opposite each other, which can stably support one section of the outer side of the wheel hub.

[0011] The arc-shaped mating surface is set according to the outer diameter of the wheel hub.

[0012] The first and third supports have the same cross-sectional area, the third support is taller than the first support, the second support has a smaller cross-sectional area than both the first and third supports, and its height is greater than the third support. Because the outer diameters of the two ends of a large wheel hub are different, and the outer diameter of the middle section is smaller than that of the ends, the heights and cross-sectional areas of the first, second, and third supports are adjusted accordingly. Since the weight of the wheel hub is mainly concentrated at both ends, the first and third supports are set to have larger cross-sectional areas, while the cross-sectional area of ​​the second support can be smaller, saving material and reducing costs.

[0013] The inner core is made of HT250 gray cast iron, and the outer shell is assembled by welding steel plates.

[0014] The connecting body is a steel plate with a hollow center, or a square steel pipe connected to the top and bottom of two adjacent supports respectively.

[0015] The square steel pipes of the connector are arranged parallel to each other between two supports in the same group, horizontally between the bottoms of two supports in different groups, and inclined between the tops.

[0016] The stabilizing frame is made of steel plate or square steel pipes connected in a triangular shape.

[0017] The beneficial effects of this utility model are:

[0018] It has low manufacturing costs, can safely and stably fix large wheel hubs for normalizing heat treatment, is not prone to deformation, and can be reused. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the normalizing heat treatment fixture used in Example 1 for large wheel hubs.

[0020] Figure 2 This is a schematic diagram of the supporting structure.

[0021] Figure 3This is a side view of the support structure.

[0022] Figure 4 This is a schematic diagram of the normalizing heat treatment fixture used in large wheel hubs in Example 2.

[0023] Figure 5 This is a schematic diagram of the normalizing heat treatment and air cooling of the wheel hub in Example 1.

[0024] Icon labels:

[0025] 100. Support body; 200. Connector; 300. Sturdy legs; 400. Wheel hub; 500. Heat treatment workshop; 600. Transfer platform; 700. Air-cooled fan; 800. Internal support;

[0026] 101. Inner core; 102. Outer shell; 103. First support body; 104. Second support body; 105. Third support body; 106. Arc-shaped mating surface. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] This utility model provides a normalizing heat treatment fixture for large wheel hubs. The preferred embodiment of the normalizing heat treatment fixture for large wheel hubs is described below.

[0029] Example 1

[0030] Reference Appendix Figure 1 and 2 In this embodiment, the normalizing heat treatment fixture applied to large wheel hubs includes three sets of support bodies 100 connected in sequence. Each set of support bodies 100 is fixedly connected to each other by a connector 200. Each set of support bodies 100 includes two support bodies 100 arranged symmetrically. The two support bodies 100 in the same set are fixedly connected by a connector 200. Each support body 100 includes an inner core 101 and an outer shell 102 nested inside and outside. Each outer shell 102 of each support body 100 is provided with a stable foot 300.

[0031] In this embodiment, the support bodies 100 are arranged in two columns and three rows, with a hexagonal symmetrical distribution. Adjacent support bodies 100 are connected by connectors 200. The length of the support bodies 100 is set according to the large diameter sections at both ends and the small diameter section in the middle of the hub 400, forming a tooling that stably supports the hub 400. This tooling can distribute the weight and thermal stress of the hub 400 and prevent uneven deformation. To ensure that the tooling remains unchanged during heat treatment, the support body 100 is designed with a nested connection between the inner core 101 and the outer shell 102. The inner core 101 is made of HT250 gray cast iron, which is not easily deformed during normalizing heat treatment. The outer shell 102 is made of weldable steel plate to ensure the overall stability of the tooling.

[0032] HT250 gray cast iron is not easily deformed during normalizing heat treatment, but its weldability is poor. Therefore, to ensure the overall stability of the tooling and to connect and fix the supports 100, a steel plate is welded to form an outer shell 102. The HT250 gray cast iron inner core 101 is embedded in the outer shell 102 and welded together. Adjacent supports 100 are welded together by connectors 200. The tooling material has a similar coefficient of thermal expansion to the wheel hub 400, and a small expansion gap is reserved between the inner core 101 and the outer shell 102 to avoid deformation under high temperature compression.

[0033] In this embodiment, the support body 100 is divided into a first support body 103, a second support body 104, and a third support body 105, and the above three types of support bodies 100 are connected sequentially. In some other embodiments, the support body 100 may be configured as four or more groups. The first support body 103 and the third support body 105 have the same cross-sectional area, the third support body 105 is greater than the height of the first support body 103, the cross-sectional area of ​​the second support body 104 is smaller than the cross-sectional areas of the first support body 103 and the third support body 105, and the height of the second support body 104 is greater than the height of the first support body 105.

[0034] Because the outer diameters of the two ends of a large wheel hub are different, and the outer diameter of the middle section is smaller than that of the two ends, the height and cross-sectional area of ​​the first support 103, the second support 104, and the third support 105 are set accordingly. Since the weight of the wheel hub 400 is mainly concentrated at both ends, the first support 103 and the third support 105 are set to have larger cross-sectional areas, while the cross-sectional area of ​​the second support 104 can be smaller, saving materials and reducing costs.

[0035] Reference Appendix Figure 2 and 3The outer shell 102 has an opening at the top, and the inner core 101 is embedded inside the outer shell 102 and fixedly connected. The top of the inner core 101 is flush with the top of the outer shell 102. The top of the support body 100 is an arc-shaped mating surface 106, and the arc-shaped mating surfaces 106 of the two supports 100 in the same group are arranged opposite each other. The arc-shaped mating surface 106 is set according to the outer diameter of the hub 400. The inner core 101 is flush with the top of the outer shell 102 and forms an arc-shaped mating surface 106. The arc-shaped mating surfaces of the two supports 100 in the same group are arranged opposite each other, which can stably support one section of the outer side of the hub 400.

[0036] Taking the outer shell 102 of the third support 105 as an example, the outer shell 102 is a box-shaped structure with an open top, and is formed by welding five 20mm thick steel plates. The four steel plates forming the sides include two plates whose top edges are cut into arc shapes along the width direction, and two other plates of different lengths, with their top edges also cut into arc shapes along the thickness direction. The steel plate at the bottom of the outer shell 102 needs to be relatively flat and have good contact with the ground or other supporting surfaces to ensure the stability of the tooling. The top opening of the outer shell 102 mates with the inner core 101 to form an arc-shaped mating surface 106, ensuring a stable fit with the outer side of the end of the hub 400.

[0037] In this embodiment, the connector 200 is a square steel pipe that is connected to the top and bottom of two adjacent support bodies 100 respectively. The square steel pipes of the connector 200 are arranged parallel between the two support bodies 100 in the same group, horizontally between the bottoms of the two support bodies 100 in different groups, and inclined between the tops.

[0038] In the same group of support bodies 100, the connecting bodies 200 between the two support bodies 100 are respectively connected to the top and bottom of their opposite sides. In this embodiment, there are two connecting bodies 200 between the two support bodies 100 in the same group, and the two connecting bodies 200 are arranged in parallel. Since there is a certain distance between the two support bodies 100 in the same group, and the hub 400 is a rotating body with a cylindrical side, after the hub 400 is placed in the tooling, the lowest point of the cylindrical surface of the hub 400 that contacts the support body 100 in the same group will be lower than the lowest point of the top of the support body 100 in the same group. It is necessary to set the connecting body 200 located between the tops of the two support bodies 100 downwards to avoid contact with the hub 400. The long side of the connecting body 200 located at the bottom of the same group of support bodies 100 has good contact with the ground or other supporting surface, and works with the two support bodies 100 in the same group to play a more stable role.

[0039] Two adjacent supports 100 from different groups are connected by two connectors 200. The support 100 connecting the bottoms of the two supports 100 has a long side that allows for good extrusion with the ground or other supporting surface, thus providing greater stability. The connector 200 between the tops of the two supports 100 needs to be angled due to the height difference between the two adjacent supports 100, and the connection point between the connector 200 and the support 100 should ideally be located on the same cross-section of the support 100. Referring to the second support 104, the connection point between its top and the connector 200 between it and the adjacent second support 104 should be located on the same cross-section. This arrangement improves the overall rigidity of the fixture.

[0040] The hollow structure formed by the connector 200 improves the air-cooling effect after the normal heat treatment of the wheel hub 400.

[0041] The stabilizing leg 300 is a square steel tube connected in a triangular shape. One side of the stabilizing leg 300 contacts the ground or support surface, and works with the connector 200 between the bottom of the support body 100 to make the fixture more stable. The other side is a beveled edge, which connects to the other end of the bottom side of the support body 100 and the top of the support body 100 to further improve the stability of the fixture.

[0042] After the tooling is manufactured as a whole, a high-temperature resistant material is sprayed on its outer surface to extend its service life.

[0043] Reference Appendix Figure 5The wheel hub 400 is hoisted onto the tooling. Since the arc-shaped mating surface 106 of the support body 100 is designed according to the cylindrical surface of the wheel hub 400, the two end faces of the wheel hub 400 mate with the first support body 103 and the third support body 105 respectively, and the middle section mates with the second support body 104, ensuring the wheel hub 400 is stably positioned. Additional inner supports 800 are installed inside the two ends of the wheel hub 400. The inner supports 800 are designed as rod-like structures with widened and thickened ends, unlike the single-rod supports commonly used in current wheel hub heat treatment. The inner supports 800 offer better stability. A hoisting section is provided at one end, and the hoisting section is securely welded to the inner supports 800. Due to the large inner diameter of large wheel hubs, the size and weight of the inner supports 800 increase accordingly. They can be directly hoisted to both ends of the wheel hub using the hoisting section, allowing operators to install the inner supports 800 simply by pushing and pulling. The wheel hub 400 is transported to the heat treatment workshop 500 via a transfer platform 600 for normalizing heat treatment. During this process, the tooling, with its inner core 101 made of HT250 gray cast iron, is not easily deformed, and the weldability between the outer shell 102 and the connecting body 200 is excellent. After heat treatment, the transfer platform 600 removes the wheel hub 400 from the heat treatment workshop 500, and the wheel hub 400 and tooling are cooled together by an air-cooling fan 700. Compared to a split wheel hub 400 bracket, the tooling in this embodiment is safer and more stable, reducing safety risks and preventing accidents during heat treatment that could render the wheel hub 400 unusable.

[0044] Example 2

[0045] In this embodiment, the normalizing heat treatment fixture applied to large wheel hubs includes three sets of support bodies 100 connected in sequence. Each set of support bodies 100 is fixedly connected to each other by a connector 200. Each set of support bodies 100 includes two symmetrically arranged support bodies 100. The two support bodies 100 in the same set are fixedly connected by the connector 200. Each support body 100 includes an inner core 101 and an outer shell 102 nested inside and outside. Each outer shell 102 of each support body 100 is provided with a stabilizing bracket 300. The inner core 101 is made of HT250 gray cast iron, and the outer shell 102 is assembled by welding steel plates.

[0046] Unlike Embodiment 1, in this embodiment, the connecting body 200 is a steel plate with a hollow center, and the stabilizing bracket 300 is composed of welded steel plates.

[0047] Reference Appendix Figure 4Two supports 100 in the same group are welded together by a rectangular steel plate with a hollow center. One side of the steel plate contacts the ground or support surface to improve the stability of the fixture. The top surface of the connecting body 200 between adjacent supports 100 in different groups is inclined, referring to the inclined connecting body 200 in Embodiment 1. The stabilizing bracket 300 is a right-angled triangular steel plate, with one right-angled side welded to the side of the support 100 and the other right-angled side contacting the ground or support surface.

[0048] In this embodiment, the connection body 200 and the stabilizing bracket 300 are made of steel plates, which can further improve the overall stability of the tooling. Compared with the practical square steel pipe, the overall weight and cost are increased.

[0049] Reference Appendix Figure 4 In this embodiment, the support body 100 includes a first support body 103, a second support body 104, and a third support body 105, and these three types of support bodies 100 are connected sequentially. The first support body 103 and the third support body 105 have the same cross-sectional area, the third support body 105 is larger than the height of the first support body 103, the cross-sectional area of ​​the second support body 104 is smaller than the cross-sectional areas of the first support body 103 and the third support body 105, and the height of the second support body 104 is greater than the height of the third support body 105. Since the outer diameters of the two ends of the large wheel hub are different, and the outer diameter of the middle section is smaller than the outer diameters of the two ends, the heights and cross-sectional areas of the first support body 103, the second support body 104, and the third support body 105 are set accordingly. The weight of the wheel hub 400 is mainly concentrated at both ends, so the first support body 103 and the third support body 105 are set to have larger cross-sectional areas, while the cross-sectional area of ​​the second support body 104 can be smaller, saving materials and reducing costs.

[0050] The outer shell 102 has an opening at the top, and the inner core 101 is embedded inside the outer shell 102 and fixedly connected. The top of the inner core 101 is flush with the top of the outer shell 102. The top of the support body 100 is an arc-shaped mating surface 106, and the arc-shaped mating surfaces 106 of the two supports 100 in the same group are arranged opposite each other. The arc-shaped mating surface 106 is set according to the outer diameter of the hub 400. The inner core 101 is flush with the top of the outer shell 102 and forms an arc-shaped mating surface 106. The arc-shaped mating surfaces of the two supports 100 in the same group are arranged opposite each other, which can stably support one section of the outer side of the hub 400.

[0051] The tooling in this utility model addresses the problems of cumbersome operation and safety hazards associated with split-type brackets. It uses a support body 100 structure with an inner core 101 and an outer shell 102 nested together to provide stable support. Preferably, there are three groups, with two support bodies 100 in each group, achieving a hexagonal symmetrical distribution. The stability of the tooling is further improved by the truss structure or hollow steel plate structure of the connecting body 200, ensuring the safety of the normalizing heat treatment process of the wheel hub 400, reducing the scrap rate, and extending the service life of the tooling.

[0052] The above description is a preferred embodiment of the present utility model, used to illustrate the present utility model and its effects. It should be noted that, for those skilled in the art, for the purpose of making foreseeable improvements and modifications without departing from the principles of the present utility model, such improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A normalizing heat treatment fixture for large wheel hubs, characterized in that, It includes at least three sets of support bodies connected in sequence. Each set of support bodies is fixedly connected to each other by a connector. Each set of support bodies includes at least two support bodies arranged symmetrically. The two support bodies in the same set are fixedly connected by the connector. Each support body includes an inner core and an outer shell arranged in a nested manner. Each outer shell of the support body is provided with a stable foot.

2. The normalizing heat treatment fixture for large wheel hubs according to claim 1, characterized in that, The support body includes a first support body, a second support body, and a third support body, and the three types of support bodies are connected in sequence.

3. The normalizing heat treatment fixture for large wheel hubs according to claim 2, characterized in that, The outer shell has an opening at the top, and the inner core is embedded inside the outer shell and fixedly connected thereto, with the top of the inner core flush with the top of the outer shell.

4. The normalizing heat treatment fixture for large wheel hubs according to claim 3, characterized in that, The top of the support is an arc-shaped mating surface, and the arc-shaped mating surfaces of two supports in the same group are arranged opposite each other.

5. The normalizing heat treatment fixture for large wheel hubs according to claim 4, characterized in that, The arc-shaped mating surface is set according to the outer diameter of the wheel hub.

6. The normalizing heat treatment fixture for large wheel hubs according to claim 2, characterized in that, The first support and the third support have the same cross-sectional area, the third support is greater than the height of the first support, the cross-sectional area of ​​the second support is smaller than the cross-sectional areas of the first support and the third support, and the height of the second support is greater than the height of the third support.

7. The normalizing heat treatment fixture for large wheel hubs according to claim 1, characterized in that, The inner core is made of HT250 gray cast iron, and the outer shell is assembled by welding steel plates.

8. The normalizing heat treatment fixture for large wheel hubs according to claim 1, characterized in that, The connecting body is a steel plate with a hollow center, or a square steel pipe connected to the top and bottom of two adjacent supports respectively.

9. A normalizing heat treatment fixture for large wheel hubs according to claim 8, characterized in that, The square steel pipes of the connector are arranged parallel to each other between two supports in the same group, horizontally between the bottoms of two supports in different groups, and inclined between the tops.

10. A normalizing heat treatment fixture for large wheel hubs according to any one of claims 1 to 9, characterized in that, The stabilizing frame is made of steel plate or square steel pipes connected in a triangular shape.

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